diff --git a/kontor-javalin/api/build.gradle b/kontor-javalin/api/build.gradle
index e2cb6db..2934926 100644
--- a/kontor-javalin/api/build.gradle
+++ b/kontor-javalin/api/build.gradle
@@ -15,3 +15,22 @@ application {
     mainClass = "de.thpeetz.kontor.api.Main"
     mainModule = "de.thpeetz.kontor.api"
 }
+
+task fatJar(type: Jar) {
+    manifest {
+        attributes 'Main-Class': 'de.thpeetz.kontor.api.Main'
+        //attributes (
+        //    'Main-Class': 'de.thpeetz.kontor.api.Main',
+        //    'Main-Module': 'de.thpeetz.kontor.api'
+        //)
+    }
+    //archiveBaseName = 'all-in-one-jar'
+    duplicatesStrategy = DuplicatesStrategy.EXCLUDE
+    from { configurations.runtimeClasspath.collect { it.isDirectory() ? it : zipTree(it) } }
+    with jar
+}
+
+build.dependsOn fatJar
+distZip.dependsOn fatJar
+distTar.dependsOn fatJar
+startScripts.dependsOn fatJar